let num = 10;

function t() {
    return num
}
const increaseNumber = () => num++;
const increasePassedNumber = (number) => number++;

const num1 = increaseNumber();
const num2 = increasePassedNumber(num1);

console.log(num1); //? 10 因为++在后面
console.log(num2); //? 10 因为num1为10 且++在后面
console.log(t()) //? 11 被num1改变了
